I recently bought a 300E with a 2.6, not sure it's badged correctly. Anyway, I had a mechanic tell me that the fuel injection system will bleed back into the tank, causing it to crank longer than it should before firing up, especially when the car has not been run for a few days. He recomended cycling the iginition switch 2-3 times to get the pump to pressurize the system. Seems to help.